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Weird shadows from windows?

Hello everyone!

This is my first post here so sorry if I posted it in the wrong section...

Basically I am new to UE4 and I want to create windows. The problem is that I get weird blocky shadows from my windows. I also get a few warnings when building lightning:

Object has overlapping UVs.

Lightmap UV are overlapping by 16.3%. Please adjust content - Enable Error Coloring to visualize.

My glass material is from here: https://www.youtube.com/watch?v=sRQ5z8i_SV8

My window object: http://free3dbase.com/3d-model/shower-wall-first-90/1154/221

And a picture of my problem: Those blocky shadows are the problem

Any help is appreciated! Thank you very much!

EDIT: I just realised this should be in the rendering section... Im really sorry...

Product Version: UE 4.12
problem.png (471.3 kB)
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asked Jul 21 '16 at 04:02 PM in Rendering

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1 answer: sort voted first

Hey mateo,

I've moved the post to the Rendering section for you.

Also, you may want to take a look at the Wiki Lighting Troubleshooting Guide for some insight to these types of common issues.

Specifically the following ones:

Between these two sections it should help you resolve your issues. If you're not sure about lightmapping and how to fix this in a 3D modeling program you can see our documentation linked below for more in-depth details.

I hope this helps.


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answered Jul 21 '16 at 06:18 PM

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Tim Hobson ♦♦ STAFF
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avatar image mateo226 Jul 21 '16 at 06:29 PM

Thank you very much Tim! I've seen a few answers from you before and it seems like you know what youre doing :) I am reading these links as I am writing this and I will post an update after.

avatar image mateo226 Jul 21 '16 at 06:42 PM

I have read all of the provided links... I tried channging the lightmap resolution, I tried changing the build lightning quality, I created the second UV channel about 20 times now. I changed the lightmap index to 1 aswell... Im starting to think UE4 isn't for me.. Lightning is really complicated...

I also added another window model to see whether the problem would go away, but it didnt, in fact now it has weird shadows on the border: alt text

problem2.png (453.4 kB)
avatar image ytianlong Jul 26 '16 at 06:31 AM

you must set the lightmass resolution of the floor bigger instead of the window

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